Ballpoint pen



FIG. 1 is a front view of the ballpoint pen of my invention;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof, the right side being a mirror image;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a front, right side perspective view thereof. 

The ornamental design for a ballpoint pen, as shown and described. 